It is only during the winter months that the Grebes become pelagic or marine in their habits, and even some species are much less addicted to a sea life than others. We will now proceed briefly to glance at the British species.
GREAT CRESTED GREBE.
This, the largest species, the Podicipes cristatus of naturalists, is chiefly an inland bird, but resorts to the sea when fresh waters are frozen. I have sometimes met with half a dozen together in a quiet bay, under these circumstances, and very graceful interesting birds they are. They rarely come upon the land at these times, swimming about and diving from time to time in quest of food. Like the Divers, they sometimes sink the body very low in the water, but under ordinary conditions sit rather high, with the long neck held well up, the head turned at intervals in all directions as if on the look out for enemies. They always prefer to dive when pursued; and as this species more especially is in great demand by plumasiers, and subject to much persecution, it is wary and shy in extreme. The food of this Grebe whilst on the sea is composed largely of fish, but inland the bird’s tastes are more omnivorous. Sometimes many of its own feathers are found in its stomach, mixed with the food, but as yet ornithologists have been unable to assign any plausible explanation of the fact. In Spring, the adults assume two very conspicuous crests or horns of a dark brown colour, and a tippet or ruff of bright bay, shading into nearly black on the margin. The birds now retire inland to meres and lakes, where the shallows are full of reeds, sedges, rushes, and other aquatic vegetation, and here, at some distance from the shore, a large floating nest is made, composed of dead and decaying vegetation. As the bird is sometimes gregarious several nests may often be found within a small area—huge floating rafts moored to the reeds, or built up from the bottom of the shallow water. In a shallow depression at the top four or five eggs are laid, elliptical in shape, chalky in texture, and white, until contact with the bird’s wet feet and the wet nest covers them with stains. Several mock nests are often made in the vicinity of the one containing the eggs, probably destined as resting places for the future young. The sitting bird very dexterously covers its eggs with weed when alarmed, previous to slipping off the nest into the water. The note of this Grebe is a loud kak.
RED-NECKED GREBE.
This Grebe, the Podicipes griseigena of Boddaert, and the P. rubricollis of most modern naturalists, is a fairly common winter visitor to the seas off our eastern and southern coasts, from the Orkneys to Cornwall. The range of the Red-necked Grebe outside our limits is a wide one, and embraces during summer the sub-Arctic portions of Europe, Asia, and America, becoming much more southerly in winter. During winter this Grebe may be met with close inshore, yet it seldom or never visits the land, living exclusively on the sea. Its habits at this season do not differ in any marked degree from those of its congeners. It may be seen swimming to and fro, sometimes just outside the fringe of rough surf, diving from time to time in quest of its food, which at this season is composed of fish principally. The nuptial ornaments of this Grebe are not so conspicuous as those of the preceding species, the dark crests are shorter, the tippet is scarcely perceptible, and the lower neck and upper breast are rich chestnut. In winter plumage this Grebe is best distinguished by its large size—next in this respect to the Great Crested Grebe—and by the absence of the white streak over the eye, which characterises that bird then. In April the Red-necked Grebe returns to its accustomed inland summer haunts to breed. These are reed and rush-fringed lakes and ponds. Here in the shallows a floating nest of rotten vegetation is formed, smaller than that of the preceding species, but otherwise closely resembling it. Many pairs may be found breeding close together—in colonies, so to speak. The four or five elliptical shaped eggs are laid in May or June, dirty white in colour, chalky in texture. The same habit of covering the eggs with weeds, previous to leaving them, may also be noted.
BLACK-NECKED GREBE.
This bird, the Podicipes nigricollis of systematists, is so rarely met with in the British area, that it scarcely requires more than a passing allusion. Examples occasionally occur on our eastern and southern coasts especially, but the bird is too rare to form any feature in the ornithology of the British seaboard. It may be readily distinguished from the other European Grebes by its decidedly up-curved bill, and by the large amount of white on the primaries and secondaries. In the nuptial plumage the head and neck are black. In its habits generally it differs little from the other species.
SCLAVONIAN GREBE.
Along the eastern coasts of England, and round most of the Scottish littoral, as well as off Ireland, this species, the Podicipes cornutus of most naturalists, is of tolerably frequent occurrence during winter. It requires all the skill of an expert ornithologist to distinguish this Grebe in winter plumage, so closely does it resemble the Red-necked species. It is a shorter winged bird, and has the three outermost secondaries dusky brown, instead of white, as in that bird, whilst the previous species is always distinguishable by its up-curved bill. There is nothing in the habits of this Grebe to call for special remark: it keeps exclusively to the water, dives to escape danger and to capture prey, and swims beneath the surface as adroitly as a frog. The Sclavonian Grebe is a wide ranging species, inhabiting during summer the Arctic and sub-Arctic regions of Europe, Asia, and America, retiring southwards in winter. This Grebe is exceptionally remarkable for its nuptial ornaments, but which, as usual, are confined to the head and upper neck. Two chestnut or bay-coloured crests start backwards over the eyes, whilst the tippet is black. This ornament, when extended to its utmost, looks very beautiful, and gives the head an appearance of being surrounded by a glittering aureole. This Grebe is a late breeder, the eggs not being laid before June. It retires to fresh-water pools for the purpose of nesting, and resembles the other species closely in its habits at this season, making a slovenly floating nest, and laying four or five dull white eggs.